Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 3, Pages 816-822Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp109803n
Keywords
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Funding
- National 973 Program [2007-CB936702, 2011CBA00702]
- National Science Foundation of China [50973105, 50773078]
- CAS [KGCX2-YW-326]
- Key Scientific and Technological Program of Jilin Province [10ZDGG012]
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We compare the impacts of tetracyanoborate and dicyanamide anions in solvent-free ionic liquid electrolytes upon the optoelectronic features of dye-sensitized solar cells based on an organic push-pull chromophore. With respect to dicyanamide, tetracyanoborate confers a bathochromic and higher photocurrent response upon a dye-coated mesoporous titania film. Numerical simulations on electrical impedance spectroscopies disclose that tetracyanoborate anion S evoke a downward displacement of the conduction-band edge of an electrolyte-sinking nanocrystalline film in comparison with dicyanamide, generating a more favorable energy-offset at the titania/dye interface and therefore a better exciton dissociation yield, as proved via the transient emission measurements. An effective recombination reaction rate constant U-0k is used to depict the charge-transfer behavior at the titania/electrolyte interface in dye-sensitized solar cells. The negative impact of an about 4 times larger U-0k of the dicyanamide cell is overwhelmed by the noticeably higher conduction band edge, leading to the experimentally observed anion-dependent open-circuit photovoltage.
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